SLINGIES MOVE THE TEETH TO THE WIRE INSTEAD OF BRINGING THE WIRE TO THE TEETH WHICH CAUSES UNWANTED SIDE EFFECTS.

NO OTHER SYSYTEM MOVES TEETH TO THE WIRE. ALL OTHERS MOVE TEETH WITH THE WIRE THUS YOU ARE DEALING WITH THE SIDE EFFECTS OF RECIPROCAL FORCES ON ADJACENT TEETH (NEWTONS LAW III EQUAL & OPPOSITE FORCES) SEE TEXTBOOK.